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#4 Sol Campbell
In 2001, Arsene Wenger completed and signed Sol Campbell on a free transfer from rivals Tottenham Hotspur in what remains one of the most controversial transfer moves in the history of the Premier League.
Campbell spent more than a decade at Spurs before joining Arsenal. The England international surprised the footballing world with the move but his decision, and that of Wenger to poach a player from the club's fierce local rivals, would be vindicated as he was a pivotal part of the Invincibles' unbeaten defence.
The centre-back was instrumental in the club's run to their only UEFA Champions League final appearance in 2006. The Englishman won 73 caps for England and remains one of the best defenders the country has ever produced.
While he might be one of the most controversial signings, he was also one of the most important signings Wenger has made.
